Pictures & Graphics:
Pixabay: https://pixabay.com
or
Adobe Stock https://stock.adobe.com
PNG Icons:
DNA: Icons made by Freepik from www.flaticon.com
Notepad: Icons made by Freepik from www.flaticon.com
Medical Samples: Icons made by Freepik from www.flaticon.com
Items Connnecting: Icons made by Freepik from www.flaticon.com
Lightbulb: Icons made by Freepik from www.flaticon.com